How to Bleed and Replace Brake Fluid on a 2009 Suzuki King Quad 750AXi 4X4
Shop parts for a 2009 Suzuki King Quad 750AXi 4X4 ATV.
This MotoSport-exclusive guide walks you through replacing and bleeding the brake fluid on a 2009 Suzuki King Quad 750AXi 4X4. Follow these steps carefully, use the correct materials, and observe all safety precautions.
What you need
- DOT4 brake fluid (do not mix with DOT3/5 silicone)
- Clear plastic tubing that fits snugly over bleeder nipples
- Small catch bottle and a clean container for old fluid
- Wrench set for bleeder nipples and banjo bolts (use correct sizes)
- Turkey baster or syringe (to remove old fluid from the reservoir)
- Rubber gloves, safety glasses, rags
- Brake cleaner and a small wire brush
- Optional: vacuum or pressure bleeder for faster, cleaner bleeding
Model notes — what's specific to the 2009 King Quad 750AXi
- The master cylinder reservoir is mounted on the handlebar area under the plastic cover. It holds a modest volume of fluid, so topping and flushing require attention to avoid drawing air into the system.
- This model does not use ABS; bleeding is straightforward hydraulic line bleeding. Calipers use standard bleeder nipples and banjo-mounted caliper lines with crush washers. Always replace crush washers when removing banjo bolts.
- King Quad calipers are accessible but the rear calipers may be harder to reach depending on aftermarket racks or accessories. Remove racks or guards if needed for clear access.
- Brake pedal and lever free-play and pushrod adjustment should be checked after bleeding; the AXi fuel-injection model relies on firm brake action for safe operation.
Preparation
- Work on a level surface, engine off, key off. Secure the ATV on a stand so wheels can turn freely if you plan to actuate calipers by spinning wheels.
- Loosen the reservoir cap slowly; keep dirt away from the open reservoir. Cover nearby painted surfaces & plastics with rags brake fluid will damage paint.
- Use a turkey baster or syringe to remove as much old fluid from the reservoir as possible before refilling with new DOT4 fluid.
- Top reservoir with fresh DOT4, leaving the cap loosely fitted to prevent contamination while you bleed.
Bleeding strategy — general rule
Always bleed beginning with the wheel farthest from the master cylinder and proceed to the closest. On most King Quad layouts that will be: rear passenger (farthest), rear driver, front passenger, front driver (closest). If in doubt, identify which caliper runs farthest from the master cylinder by tracing the brake lines.
Step-by-step bleeding (manual pump method)
- Attach clear tubing to the bleeder nipple of the first caliper and route the tube into a catch bottle partially filled with some used fluid to prevent air re-entry.
- Have an assistant slowly depress and hold the brake lever/pedal. If alone, use a one-person vacuum/pressure bleeder or use the gravity method with patience.
- With the lever/pedal held, open the bleeder nipple about 1/4 turn. Fluid and air will flow into the tubing. Close the nipple before the lever/pedal is released. Repeat until no air bubbles are visible and fluid is clear.
- Top the master cylinder reservoir frequently to prevent it from running dry and drawing air into the system.
- Repeat the process at each caliper in the sequence: farthest to nearest.
- After all calipers are bled, pump the brake lever/pedal several times. It should feel firm and not spongy. If spongy, repeat bleeding where necessary.
Alternative methods
- Vacuum/pressure bleeder: Connect to the reservoir or each bleeder nipple as directed by the tool manufacturer. These reduce the need for an assistant and speed the job.
- Gravity bleed: Open bleeders and let fluid flow down; this is slow and requires careful reservoir level monitoring.
Reassembly and checks
- Torque any banjo bolts and caliper fasteners to manufacturer specs if available; if not available, snug securely without over-torquing. Replace banjo crush washers whenever you disconnect a line.
- Clean spilled fluid from painted parts immediately with water and brake cleaner where appropriate; brake fluid damages paint and plastics.
- Confirm brake lever/pedal feel at rest and with the vehicle loaded slightly. Check for leaks around bleeder nipples, banjo bolts, and hose fittings.
- Test ride slowly in a safe area to verify braking performance before normal use.
- Properly dispose of used brake fluid according to local regulations.
Inspection points specific to the King Quad 750AXi
- Check brake hose condition for cracking or swelling near the ends and fittings. Replace hoses showing damage or soft spots.
- Inspect caliper pistons for corrosion or sticking. Seized pistons will need caliper service or replacement.
- Check pad thickness and rotor condition while calipers are off. Replace pads that show uneven wear or are near minimum thickness.
- AXi models that have seen heavy utility work may have contaminated fluid from water ingress via a loose reservoir cap or damaged seals; in those cases perform a full system flush instead of a partial top-up.
Safety reminders
- Never reuse old brake fluid. Do not mix DOT ratings or use silicone DOT5 fluid.
- Brake fluid will damage paint and plastics. Protect surfaces and clean spills immediately.
- If you are unsure of a step or suspect internal master cylinder or caliper damage, consult a professional technician.
Perform maintenance at regular intervals based on severe-use or time-based service schedules; fresh brake fluid every two years is a good baseline for reliability in off-road use.
Related Shopping Categories
Shop Brake Fluid for a 2009 Suzuki King Quad 750AXi 4X4 ATV.
Shop Brake Bleeders for a 2009 Suzuki King Quad 750AXi 4X4 ATV.
Shop Brake Pads for a 2009 Suzuki King Quad 750AXi 4X4 ATV.
Shop Brake Lines for a 2009 Suzuki King Quad 750AXi 4X4 ATV.
Shop Brake Tools for a 2009 Suzuki King Quad 750AXi 4X4 ATV.
Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.